:root{--bg-color: #FBFAF6;--bg-transparent: rgba(251, 250, 246, .85);--primary-color: #8B7355;--primary-light: #A89276;--primary-dark: #6E593F;--text-color: #213547;--text-muted: #576F72;--card-bg: rgba(125, 157, 156, .05);--card-hover-bg: rgba(125, 157, 156, .08);--border-color: #E9B384;--border-light: rgba(233, 179, 132, .25);--success: #9EB384;--success-light: rgba(158, 179, 132, .15);--error: #D0A2A2;--error-light: rgba(208, 162, 162, .15);--shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, .03), 0 2px 4px -1px rgba(0, 0, 0, .02);--shadow-md: 0 10px 15px -3px rgba(139, 115, 85, .08), 0 4px 6px -2px rgba(139, 115, 85, .04);--shadow-lg: 0 20px 25px -5px rgba(139, 115, 85, .12), 0 10px 10px -5px rgba(139, 115, 85, .06);--radius-sm: 8px;--radius-md: 16px;--radius-lg: 24px;--radius-full: 9999px;--font-display: "Plus Jakarta Sans", system-ui, -apple-system, sans-serif;--font-body: "Plus Jakarta Sans", system-ui, -apple-system, sans-serif}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%;margin:0;padding:0;overflow:hidden;background-color:var(--bg-color)}body{color:var(--text-color);font-family:var(--font-body);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.5}.app-wrapper{height:100%;width:100%;display:flex;justify-content:center;align-items:center;background:radial-gradient(circle at top right,#f5ebe0,#fbfaf6 60%,#e3d5ca);overflow:hidden}.app-container{width:100%;max-width:480px;height:100vh;height:100dvh;background-color:var(--bg-color);box-shadow:var(--shadow-lg);display:flex;flex-direction:column;position:relative;overflow:hidden;border-left:1px solid var(--border-light);border-right:1px solid var(--border-light)}@media (max-width: 480px){.app-container{max-width:100%;border-left:none;border-right:none;box-shadow:none}}header{position:sticky;top:0;z-index:50;background-color:var(--bg-transparent);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-bottom:1px solid var(--border-light);padding:16px 20px;display:flex;justify-content:space-between;align-items:center;transition:all .3s ease}.logo{font-size:1.35rem;font-weight:800;color:var(--primary-color);letter-spacing:.5px;display:flex;align-items:center;gap:6px;cursor:pointer}.logo-icon{background-color:var(--primary-color);color:var(--bg-color);width:28px;height:28px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-weight:900;font-size:.95rem}.logo span{font-weight:400;color:var(--text-muted);font-size:.9rem}main{flex:1;padding:20px;display:flex;flex-direction:column;overflow-y:auto;min-height:0}main::-webkit-scrollbar{width:4px}main::-webkit-scrollbar-track{background:transparent}main::-webkit-scrollbar-thumb{background:var(--border-light);border-radius:var(--radius-full)}.bottom-nav{height:72px;background-color:var(--bg-transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-top:1px solid var(--border-light);display:grid;grid-template-columns:repeat(4,1fr);align-items:center;z-index:40;padding:0 10px;flex-shrink:0}.nav-item{display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--text-muted);font-size:.75rem;font-weight:500;cursor:pointer;background:none;border:none;gap:4px;transition:all .2s ease;height:100%}.nav-item.active{color:var(--primary-color);font-weight:700}.nav-item svg{width:22px;height:22px;transition:transform .2s ease}.nav-item.active svg{transform:translateY(-2px)}.hero-card{background-color:var(--card-bg);border:1px solid var(--border-light);border-radius:var(--radius-lg);padding:24px 20px;margin-bottom:24px;position:relative;overflow:hidden;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;gap:12px}.hero-glow{position:absolute;width:150px;height:150px;background:radial-gradient(circle,#e9b38426,#fbfaf600 70%);top:-50px;right:-50px;pointer-events:none}.hero-title{font-size:1.5rem;font-weight:800;color:var(--primary-color);line-height:1.25}.hero-subtitle{font-size:.9rem;color:var(--text-muted);line-height:1.5}.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:8px}.stat-item{background:#fff;border-radius:var(--radius-md);padding:12px 8px;text-align:center;border:1px solid rgba(139,115,85,.06);box-shadow:0 2px 4px #00000003}.stat-val{font-size:1.25rem;font-weight:700;color:var(--primary-color)}.stat-label{font-size:.7rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;margin-top:2px}.tab-container{display:flex;gap:8px;margin-bottom:20px;overflow-x:auto;padding-bottom:4px}.tab-container::-webkit-scrollbar{height:3px}.tab-button{padding:8px 16px;border-radius:var(--radius-full);border:1px solid var(--border-light);background-color:#fff;color:var(--text-muted);font-family:var(--font-body);font-size:.85rem;font-weight:600;white-space:nowrap;cursor:pointer;transition:all .2s ease}.tab-button.active{background-color:var(--primary-color);color:var(--bg-color);border-color:var(--primary-color)}.lessons-grid{display:flex;flex-direction:column;gap:14px}.lesson-card{background:#fff;border:1px solid rgba(139,115,85,.08);border-radius:var(--radius-md);padding:18px;display:flex;flex-direction:column;gap:12px;cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);box-shadow:0 2px 8px #8b735505}.lesson-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:var(--border-color)}.lesson-header{display:flex;justify-content:space-between;align-items:center}.lesson-title{font-size:1.15rem;font-weight:700;color:var(--primary-color)}.lesson-tag{font-size:.75rem;padding:3px 8px;border-radius:var(--radius-full);font-weight:600;background-color:var(--card-bg);color:var(--primary-color)}.lesson-tag.matome{background-color:var(--success-light);color:var(--success)}.lesson-body{display:flex;justify-content:space-between;align-items:center}.lesson-info{display:flex;flex-direction:column;gap:2px}.lesson-words-count{font-size:.85rem;color:var(--text-muted)}.lesson-progress-text{font-size:.8rem;font-weight:600;color:var(--success)}.progress-bar-container{width:100%;height:6px;background-color:#8b735514;border-radius:var(--radius-full);overflow:hidden;margin-top:4px}.progress-bar-fill{height:100%;background-color:var(--success);border-radius:var(--radius-full);transition:width .4s ease}.lesson-actions{display:flex;gap:8px;margin-top:4px}.btn{padding:10px 16px;border-radius:var(--radius-full);border:none;font-family:var(--font-body);font-size:.85rem;font-weight:700;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);display:inline-flex;align-items:center;justify-content:center;gap:6px;text-decoration:none}.btn:active{transform:scale(.96)}.btn-primary{background-color:var(--primary-color);color:var(--bg-color);box-shadow:0 4px 10px #8b735533}.btn-primary:hover{background-color:var(--primary-dark)}.btn-secondary{background-color:var(--card-bg);color:var(--primary-color);border:1px solid rgba(139,115,85,.15)}.btn-secondary:hover{background-color:var(--card-hover-bg)}.btn-icon{width:40px;height:40px;padding:0;border-radius:var(--radius-full);background-color:#fff;border:1px solid var(--border-light);color:var(--text-muted);display:flex;align-items:center;justify-content:center;transition:all .2s ease}.btn-icon:hover{border-color:var(--primary-color);color:var(--primary-color)}.study-header{display:flex;justify-content:space-between;align-items:center;padding:10px 0;margin-bottom:20px}.study-progress-container{flex:1;margin:0 16px}.study-progress-meta{display:flex;justify-content:space-between;font-size:.8rem;color:var(--text-muted);margin-bottom:4px;font-weight:600}.card-container{flex:1;display:flex;align-items:center;justify-content:center;perspective:1000px;margin:20px 0;min-height:320px}.flashcard{width:100%;height:340px;position:relative;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.4,0,.2,1);cursor:pointer}.flashcard.flipped{transform:rotateY(180deg)}.card-face{position:absolute;width:100%;height:100%;backface-visibility:hidden;border-radius:var(--radius-lg);padding:30px;display:flex;flex-direction:column;justify-content:space-between;align-items:center;box-shadow:var(--shadow-lg);border:1px solid var(--border-light)}.card-front{background:linear-gradient(135deg,#fff,#fcfaf7)}.card-back{background:linear-gradient(135deg,#fcfaf7,#f5f1e9);transform:rotateY(180deg)}.card-face:before{content:"";position:absolute;top:8px;left:8px;right:8px;bottom:8px;border:1px dashed rgba(139,115,85,.1);border-radius:calc(var(--radius-lg) - 6px);pointer-events:none}.card-unit{font-size:.8rem;text-transform:uppercase;letter-spacing:1px;color:var(--text-muted);font-weight:700}.card-content-main{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;flex:1}.kanji-display{font-size:3.25rem;font-weight:800;color:var(--primary-color);letter-spacing:2px;text-align:center}.reading-display{font-size:1.5rem;font-weight:500;color:var(--text-muted);background-color:#8b73550f;padding:4px 16px;border-radius:var(--radius-full)}.meaning-section{display:flex;flex-direction:column;align-items:center;gap:8px;margin-top:10px;width:100%}.meaning-vn{font-size:1.35rem;font-weight:700;color:#2c3639;text-align:center}.meaning-en{font-size:1rem;font-style:italic;color:var(--text-muted);text-align:center}.audio-btn{background-color:var(--primary-light);color:#fff;border:none;width:38px;height:38px;border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 2px 5px #0000001a;transition:all .2s ease}.audio-btn:hover{background-color:var(--primary-color)}.card-hint{font-size:.8rem;color:var(--text-muted);display:flex;align-items:center;gap:4px;opacity:.7}.study-controls{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:10px}.btn-again{background-color:var(--error-light);color:#b35454;border:1px solid rgba(208,162,162,.3)}.btn-again:hover{background-color:#d0a2a240}.btn-good{background-color:var(--success-light);color:#556b2f;border:1px solid rgba(158,179,132,.3)}.btn-good:hover{background-color:#9eb38440}.quiz-question-card{background:#fff;border-radius:var(--radius-lg);padding:24px;border:1px solid var(--border-light);box-shadow:var(--shadow-md);margin-bottom:20px;text-align:center;display:flex;flex-direction:column;gap:16px}.quiz-q-type{font-size:.8rem;color:var(--text-muted);text-transform:uppercase;font-weight:700;letter-spacing:.5px}.quiz-q-word{font-size:2.75rem;font-weight:800;color:var(--primary-color)}.quiz-options-container{display:flex;flex-direction:column;gap:12px}.quiz-option{background:#fff;border:1px solid rgba(139,115,85,.12);border-radius:var(--radius-md);padding:16px 20px;font-family:var(--font-body);font-size:.95rem;text-align:left;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);display:flex;justify-content:space-between;align-items:center;color:#2c3639;font-weight:500}.quiz-option:hover{border-color:var(--primary-color);background-color:#8b735505}.quiz-option.correct{background-color:var(--success-light);border-color:var(--success);color:#556b2f;font-weight:700}.quiz-option.incorrect{background-color:var(--error-light);border-color:var(--error);color:#b35454;font-weight:700}.quiz-option-status{width:20px;height:20px;border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center}.search-container{position:relative;margin-bottom:16px}.search-input{width:100%;padding:12px 16px 12px 42px;border-radius:var(--radius-full);border:1px solid var(--border-light);font-family:var(--font-body);font-size:.95rem;background-color:#fff;transition:all .2s ease;outline:none}.search-input:focus{border-color:var(--primary-color);box-shadow:0 0 0 3px #8b73551a}.search-icon-wrapper{position:absolute;left:16px;top:50%;transform:translateY(-50%);color:var(--text-muted)}.word-list{display:flex;flex-direction:column;gap:10px}.word-row{background:#fff;border:1px solid rgba(139,115,85,.05);border-radius:var(--radius-sm);padding:12px 16px;display:flex;justify-content:space-between;align-items:center;transition:all .2s ease}.word-row:hover{border-color:var(--border-color);background-color:#8b735503}.word-row-main{display:flex;flex-direction:column;gap:2px}.word-row-kanji{font-size:1.1rem;font-weight:700;color:var(--primary-color)}.word-row-reading{font-size:.85rem;color:var(--text-muted)}.word-row-meaning{font-size:.9rem;font-weight:600;color:#2c3639}.word-row-side{display:flex;align-items:center;gap:12px}.word-row-lesson{font-size:.7rem;background-color:var(--card-bg);color:var(--primary-color);padding:2px 6px;border-radius:var(--radius-sm);font-weight:600}.complete-screen{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:30px;gap:16px;background:#fff;border-radius:var(--radius-lg);border:1px solid var(--border-light);box-shadow:var(--shadow-lg);margin:auto 0}.complete-icon{font-size:4rem;animation:logo-float 2s infinite ease-in-out}.complete-title{font-size:1.75rem;font-weight:800;color:var(--primary-color)}.complete-message{font-size:.95rem;color:var(--text-muted);max-width:280px}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-5px)}}.float-anim{animation:float 3s ease-in-out infinite}@keyframes border-breathe{0%,to{border-color:var(--border-light)}50%{border-color:var(--border-color)}}.breathe-border{animation:border-breathe 4s infinite ease-in-out}.study-screen-fullscreen{position:absolute;top:0;left:0;right:0;bottom:0;background-color:var(--bg-color);z-index:100;display:flex;flex-direction:column;padding:20px;box-sizing:border-box}.btn-lang{display:flex;align-items:center;gap:6px;padding:6px 14px;border-radius:var(--radius-full);border:1px solid var(--border-light);background-color:#fff;color:var(--text-muted);font-size:.8rem;font-weight:700;cursor:pointer;transition:all .2s ease;box-shadow:var(--shadow-sm)}.btn-lang:hover{border-color:var(--primary-color);color:var(--primary-color);background-color:#8b735505}.btn-lang:active{transform:scale(.96)}